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51305771 "Devil's Knot" star Reese Witherspoon and her friend, actress Naomi Watts, leave their yoga class and pick up fresh juice drinks together with friends on January 15, 2014 in Brentwood, California. FameFlynet, Inc - Beverly Hills, CA, USA - +1 (818) 307-4813

Celeb Workout Buddies

They say it's always better exercise with a friend, and that's true for the hotties of Hollywood, too. From Zac Efron to Heidi Klum, check out who's been pairing up to work it out!